A team of researchers at Microsoft say they have seen quantum effects that are evidence of elusive Majorana particles, but other experts are say it could just be electrons in disguise.
a set of calculations showing that this test can be fooled by impurities in the wires. “The topological gap protocol as currently implemented is certainly not loophole free,” he says.
Frolov says that a few details imply that what seem to be Majorana zero modes would be revealed as an effect of disorder if the experiment were repeated with even more sensitive measurements. These include small differences between measurements for the left and right edges of the wire, as well as the measurements of electrons’ energies– the same energies can be indicative of emerging Majorana zero modes or of dirt trapping the electrons.
Even if the finding holds, doubt remains about the usefulness of any such qubits. “Evidence for Majorana zero modes in quantum wires has been sought eagerly for over 10 years, and I’m glad to see this recent progress. However, imperfections in the materials continue to limit the performance of these devices,” says
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